summaryrefslogtreecommitdiff
path: root/src/soc
diff options
context:
space:
mode:
authorfdurairx <felixx.durairaj@intel.com>2015-08-21 15:36:53 -0700
committerMartin Roth <martinroth@google.com>2016-01-28 20:34:06 +0100
commitaff502e87ae57fa2dc09367d00f143b6befb9530 (patch)
tree53476f7b39033ed036b7a7bf784e2410c24d7381 /src/soc
parent71c60ca4821f9ebd51066b2fb4166fd974755666 (diff)
downloadcoreboot-aff502e87ae57fa2dc09367d00f143b6befb9530.tar.xz
soc/braswell: Fix DSP clock
The codec clock frequency was incorrectly set to 25MHz. The only available frequency is 19.2MHz through external clock and PLL. Original-Reviewed-on: https://chromium-review.googlesource.com/295768 Original-Tested-by: Hannah Williams <hannah.williams@intel.com> Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org> Change-Id: I9bef334a5a3aaee28fcc4937180896ff49969bc5 Signed-off-by: Felix Durairaj <felixx.durairaj@intel.com> Reviewed-on: https://review.coreboot.org/12732 Tested-by: build bot (Jenkins) Reviewed-by: Martin Roth <martinroth@google.com>
Diffstat (limited to 'src/soc')
-rw-r--r--src/soc/intel/braswell/chip.h8
-rw-r--r--src/soc/intel/braswell/include/soc/pm.h4
-rw-r--r--src/soc/intel/braswell/lpe.c24
3 files changed, 19 insertions, 17 deletions
diff --git a/src/soc/intel/braswell/chip.h b/src/soc/intel/braswell/chip.h
index 0f3c1d0220..6eb1451b2e 100644
--- a/src/soc/intel/braswell/chip.h
+++ b/src/soc/intel/braswell/chip.h
@@ -33,6 +33,11 @@
#define MEM_DDR3 0
#define MEM_LPDDR3 1
+enum lpe_clk_src {
+ LPE_CLK_SRC_XTAL,
+ LPE_CLK_SRC_PLL,
+};
+
struct soc_intel_braswell_config {
uint8_t enable_xdp_tap;
uint8_t clkreq_enable;
@@ -41,8 +46,7 @@ struct soc_intel_braswell_config {
int disable_slp_x_stretch_sus_fail;
/* LPE Audio Clock configuration. */
- int lpe_codec_clk_freq; /* 19 or 25 are valid. */
- int lpe_codec_clk_num; /* Platform clock pins. [0:5] are valid. */
+ enum lpe_clk_src lpe_codec_clk_src; /* 0=xtal 1=PLL, Both are 19.2Mhz. */
/* Native SD Card controller - override controller capabilities. */
uint32_t sdcard_cap_low;
diff --git a/src/soc/intel/braswell/include/soc/pm.h b/src/soc/intel/braswell/include/soc/pm.h
index 9e527e1b78..ec10101b5b 100644
--- a/src/soc/intel/braswell/include/soc/pm.h
+++ b/src/soc/intel/braswell/include/soc/pm.h
@@ -116,8 +116,8 @@
#define PLT_CLK_CTL_3 0x6c
#define PLT_CLK_CTL_4 0x70
#define PLT_CLK_CTL_5 0x74
-# define CLK_FREQ_25MHZ (0x0 << 2)
-# define CLK_FREQ_19P2MHZ (0x1 << 2)
+# define CLK_SRC_XTAL (0x0 << 2)
+# define CLK_SRC_PLL (0x1 << 2)
# define CLK_CTL_D3_LPE (0x0 << 0)
# define CLK_CTL_ON (0x1 << 0)
# define CLK_CTL_OFF (0x2 << 0)
diff --git a/src/soc/intel/braswell/lpe.c b/src/soc/intel/braswell/lpe.c
index a1a7c64266..4662b4324e 100644
--- a/src/soc/intel/braswell/lpe.c
+++ b/src/soc/intel/braswell/lpe.c
@@ -96,32 +96,30 @@ static void setup_codec_clock(device_t dev)
const char *freq_str;
config = dev->chip_info;
- switch (config->lpe_codec_clk_freq) {
- case 19:
- freq_str = "19.2";
- reg = CLK_FREQ_19P2MHZ;
+ switch (config->lpe_codec_clk_src) {
+ case LPE_CLK_SRC_XTAL:
+ /* XTAL driven bit2=0 */
+ freq_str = "19.2MHz External Crystal";
+ reg = CLK_SRC_XTAL;
break;
- case 25:
- freq_str = "25";
- reg = CLK_FREQ_25MHZ;
+ case LPE_CLK_SRC_PLL:
+ /* PLL driven bit2=1 */
+ freq_str = "19.2MHz PLL";
+ reg = CLK_SRC_PLL;
break;
default:
- printk(BIOS_DEBUG, "LPE codec clock not required.\n");
+ reg = CLK_SRC_XTAL;
+ printk(BIOS_DEBUG, "LPE codec clock default to using Crystal\n");
return;
}
/* Default to always running. */
reg |= CLK_CTL_ON;
- if (config->lpe_codec_clk_num < 0 || config->lpe_codec_clk_num > 5) {
- printk(BIOS_DEBUG, "Invalid LPE codec clock number.\n");
- return;
- }
printk(BIOS_DEBUG, "LPE Audio codec clock set to %sMHz.\n", freq_str);
clk_reg = (u32 *) (PMC_BASE_ADDRESS + PLT_CLK_CTL_0);
- clk_reg += config->lpe_codec_clk_num;
write32(clk_reg, (read32(clk_reg) & ~0x7) | reg);
}